Chehalis is a city in Lewis County, Washington, United States. The population was 7,259 at the 2010 census. It is the county seat of Lewis County.
According to the United States Census Bureau, the city has a total area of 5.55 square miles (14.37 km²), of which, 5.53 square miles (14.32 km²) is land and 0.02 square miles (0.05 km²) is water.
The city straddles Interstate 5 at a point almost exactly halfway between Seattle, Washington and Portland, Oregon. The historic downtown and most of the city's amenities lie on the east side of the freeway, nestled at the base of a small range of forested hills. On the west side of the freeway are parks, farms, and a few subdivisions developed in the hills to the west. A small airport is located immediately west of the freeway towards the northern end of the city. From numerous vantage points in the hills just west of town, one can see Mount Rainier, Mount Adams, and Mount St. Helens—weather permitting. Chehalis is a frequented stop by bicyclists while on the annual Seattle to Portland Bicycle Classic.
The Chehalis River winds its way through the valley in which the city resides, and is there joined by a tributary, the Newaukum River. Both rivers are prone to flooding during periods of abnormally heavy or persistent rain, and the lowlands from the freeway westward are particularly susceptible to inundation.
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